Hi Mopar Tim - thanks for the feedback. Even with the currently installed axle jacked up and not hanging, the driveshaft is fully seated in the transmission (bottomed out) and there is about 1/4" stopping the ujoint from going into the pinion yoke.
Just to clarify -I'm not trying to assemble this, I am tearing it all down for the swap (my first post may have been confusing, and for that I apologize). This is how the car came to me. My main concern is if there is any damage, I need to be looking for with the transmission with that input shaft being bottomed out for however long it has been before I got the car.
Thank you everyone